99866566899 has 40 divisors (see below), whose sum is σ = 164975014512. Its totient is φ = 59696040960.

The previous prime is 99866566897. The next prime is 99866566939.

99866566899 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 99866566899 - 2¹ = 99866566897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (99866566897) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 702654 + ... + 832739.

Almost surely, 2^99866566899 is an apocalyptic number.

99866566899 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

99866566899 is a deficient number, since it is larger than the sum of its proper divisors (65108447613).

99866566899 is a wasteful number, since it uses less digits than its factorization.

99866566899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535489 (or 1535480 counting only the distinct ones).

The product of its digits is 2720977920, while the sum is 81.

The spelling of 99866566899 in words is "ninety-nine billion, eight hundred sixty-six million, five hundred sixty-six thousand, eight hundred ninety-nine".